Outer right angle corner forming unit for a concrete wall form



May 14, 1957 Filed may 17, 1955 B HILLBERG OUTER RIGHT ANGLE CORNER FORMING UNIT FOR A CONCRETE WALL FORM 5 Sheets-Sheet 1 May 14, 1957 Filed May 17'. 1955 HILLBERG 2,791,818

B. OUTER RIGHT ANGLE CORNER FORMING UNIT FOR A CONCRETE WALL FORM 3 Sheets-Sheet 2 May 14, 1957 B. HILLBERG OUTER RIGHT ANGLE CORNER FORMING UNIT FOR A CONCRETE WALL FORM 3 Sheets-Sheet 3 Filed May 17, 1955 United States Patent OUTER RIGHT ANGLE CQRNER FGRMING UNIT FOR A CONCRETE WALL FORM Bror Hillberg, Chicago, Ill., assignor to Superior Copcnete Accessories, Inc., Chicago, 111., a corporation ofllhnors Application May 17, 1955, Serial No. 503,847

4 Claims. (Cl. 25131) apart relation with the panels of the first series; (3)

horizontally positioned combined tie and spreader rods which extend between and at right angles to the two series of panels and have the ends thereof projecting through and beyond the notch-formed holes between the abutting side edges of -the panels; and (4) removable clamping devices which are associated with the ends of the combined tie and spreader rods and serve when in place to hold the panels in fixed relation with the ends of the rods.

In connection with use of a concrete wall form of the aforementioned type, it is necessary when the wall to be formed is to have a right angle bend to-arrangc cer- 'metallicstrips; and in which the releasable devices for 2,791,818 -l"a.tentetl-- May 14,:1957

2 and the free side edges of the side flanges of the angle bar vertically extending open ended sockets; in which the up- .standing angle bar embodies adjacent to the inner ends of the metallic strips on the reenforcing boards a horizontally disposed C-shaped metallic strap the end parts of whichare welded to, and project outwards from, the adjacent portions of the free side edges of the side flanges of theangle bar and form vertically extending open ended sockets in juxtaposition with the sockets that are formed by the inwardly bent inner ends of the aforementioned holding the angle bar and the two panels in fixedly connected relation consist of a pair of cast metal brackets which are associated with the panels respectively and embody pairs of spaced apart depending fingers certain of which are adapted to extend downwards through the sockets that are formed by the inwardly bent inner ends of the metallic strips and the others of which are adapted to extend downwards through the sockets that are formed by the end parts of the C-shaped strap on the angle bar.

A further object of the invention is to provide an outside right angle corner forming unit of thetype and character under consideration in which the end parts of the C-shaped strap are in the'form of right angle bends, and the inner side surfaces of the pairs of depending fingers on the cast metal brackets are downwardly divergent to the end that when the fingers are driven downwards through the sockets in connection with mounting" of the brackets in place theyoperate automatically to draw the panels and angle bar towards one'another into firmly clamped relation.

A' still further object of the invention is to provide an 7 outside right angle corner forming unit which is of gentain of the panels ofone series at right angles with respect 1 to the other panels of the one series and correspondingly to arrange the panels of the other series. Heretofore difiiculty has been experienced in positioning and connecting together the two panels that serve to form the outside corner of the right angle bend in the-concrete wall that is formed by use of the form as'a whole.

One object'of this invention isto provide in connection with a concrete wall form of the type under consideration an outside right angle corner forming unit whichinvolves a simple and novel construction, effectively andefiiciently: -fulfills its intended purpose, and is so designed that it may be assembled and dismantled with facility; In general, the improved unit comprises: (1) a pair of vertically elongated rectangular upstanding panels which are posiinside inner side corners are in abutment with one 12inother; (2) an upstanding angle bar which is the same in height as the tWo panels, fits in the spacebetween the inner side edges of the panels, and is arranged so that its apex abuts against the aforementioned inside inner right angle corner forming unit of the aforementioned character in which the two panels are provided on the outer faces thereof with horizontally extending and aligned reenforcing boards which are arranged so that erally new and improved construction and is characterized by such simplicity of design that it may be produced at a comparatively low cost.

Other objects of the invention and the various advantages and characteristics of the present outside right angle corner forming unit will be apparent from the following detailed description.

The invention consists in the several novel features which are hereinafterset forth and are more particularly defined by the claims at the conclusion hereof. 4 In the drawings which accompany and form: a part of this specification or disclosureand in which like numerals of reference denote correspondingparts-throughout the several views:v

Fi re 1 is a fragmentary-prospective'view showing an outside right angle corner forming unit embodying the so tio ned 'at right angles to one another andso that their assembled or operative relation; Figure 2 is a similar perspective view except that it invention with the various component parts thereof, i. e.,

v the panels, the angle bar and the cast metal brackets, in

illustrates the finger-equipped cast metal brackets before they are driven downwards into their operative position wherein the pairs of spaced apart depending fingers thereof the innerend edges thereof. are disposed adjacent to, but

spaced at small distance inwards of, the inner side edges .of'the panels and have mounted on their outer surfaces longitudinally extending metallic strips the inner ends. of which project beyond the inner end edges of the boards and are bent inwards at substantially right angles inorderto form adjacent to the inner side edges of the panels extend downwards through the aforementioned vertically extending open ended sockets;

Figure 3 is an enlarged horizontal section taken on the line 3- 3 of Figure 1;

Figure 4 is a horizontal section illustrating the outside right angle corner forming unit in operative relation with an inside corner forming unit and additional panels so as to form a complete form for use in the formation of a concrete wall having a right angle bend or corner; and

Figure 5 is a fragmentary perspective of the angle bar of the unit, illustrating indetail the construction, arrangement and manner of mounting of the metallic C-shaped strap the. end parts of which define or form vier pally extending open ended sockets for receiving certain of, the fingers on the cast metal brackets of the unit:

lar panels 6, an upstanding angle bar 7 and a pair of releasable devices 8 for holding the angle bar and the two panels in fixedly connected and clamped relation; When the unit is in its operative position the panels 6 extend at true right angles to one another. As shown in Figure 4 of the drawings, the unit together with a pair of panels 9, a series of panels 10, 11, 12 and 13, combined tie and spreader rods 14 and releasable clamping devices is adapted to form a form for use in the formation or fabrication of a concrete wall having a right angle" bend in it. As hereinafter described more in detail, the unit in connection with use of the concrete wall form as a whole is adapted to form the outside corner ofthe right angle bend in the concrete wall that is formed by way of the form. The panels 9 are rectangular and extend vertically. They are positioned in edge to edge .relatron with the panels 6 of the outside right angle corner forming unit and form with the panels 6 an outside series of panels for the form as a whole. The four panels 10,

11, 12 and 13 are rectangular and extend vertically.

' They are arranged in edge to edge relation and form an inside series of panels in opposed but spaced apart relation with the outer series of panels consisting of panels 6 and 9. The panels 11 and 12 extend at right angles to one another, are connected together at their inner side margins by a hinge connection 16, and form with the hinge connection an inside right angle corner forming unit for the form. Such inside corner forming unit is disclosed in, and forms the subject matter of, co-pendmg patent application Serial No. 505,570, filed by me on May 3, 1955. For a more detailed description of the construction, arrangement and mode of operation of the inside corner forming unit consisting of the panels 11 and 12 and the hinge connection 16 reference may be had to said application. The combined tie and spreader rods 14 and the removable clamping devices 15 serve to hold the outer and inner series of panels in fixed spaced apart relation. It is contemplated that the two series of panels will be spaced apart a distance corresponding to the desired thickness of the concrete wall to be formed therebetween and also that after proper positioning of the two sums of panels concrete in plastic or unset form will be poured between the two series of panels for wall forming purposes. After setting or hardening of the concrete,

- the form is dismantled and then the projecting ends of the combined tie and spreader rods are severed or broken 1 angle corner forming unit are preferably formed of plywood and have oppositely disposed semi-circular notches formed in their abutting side edges. Each oppositely disposed panof notches forms a circular hole 18 for receiving one end of one of the combined tie and spreader rods 14. The plywood panels 6, 9, 10, 11, 12 and 13 are reenforced by horizontally extending boards 19 which extend across the outer faces of the panels and are fixedly secured in place in any suitable manner. The boards 19 are preferably positioned so that the imaginary longitudinal center lines thereof are in alignment with the semitically elongated vertically extending open ended sockets 22. The combined tie and spreader rods 14 extend between and at right angles to the outer and inner series of plywood panels and are arranged so that the ends thereof project through, and an appreciable distance beyond, the notch-formed holes 18. The portions of the combined tie and spreader rods that are disposed inwards of the inner faces of the panels are provided with flats 23 and weakness points 24 outwards of the flats. The extremities of the rods are provided with heads 25. The removable clamping devices 15 are associated with'the ends of the combined tie and spreader rods 14 respectively. They serve to clamp the panels of the form in edge to edge relation and also to hold the panels in fixed or rigid relation with the ends of the rods. As shown in Figures 1 and 2, the removable clamping devices comprise cast metal brackets 26 and U-shaped locking bolts 27. The brackets 26 are horizontally elongated, extend normally outwards from and at right angles to the panels and embody at their inner ends pairs of spaced apart depending fingers 28 which are adapted to fit within and extend downwards through the aforementioned elongated I vertically extending open ended sockets 22. The U- filed on April 8, 1955 and entitled Congress Wall Form."

The vertically elongated upstanding panels 6 of the outside right angle corner forming unit are the same in height and width and have fiat inner and outer faces. When in their operative or normal position the two panels 6 extend at right angles to one another and are arranged so that their inside inner corners are in abutment with one another. The inner side edges of the panels 6 are not provided withv semi-circular notches 17 and are straight or flat throughout their entire length. The inner end the inner side edges of such panels.

edges of the reenforcing boards 19 on the outer faces of the panels 6 are spaced a small distance inwards of The inner ends of the metallic strips 20 on the reenforcing boards that are connected to the outer faces of the panels 6 project beyond the inner end edges of said reenforcing boards and are bent inwards at right angles in order to form adjacent to the inner side edges of the panels 6 elongated vertically extending open ended sockets 29.

The angle bar 7 of the outside right angle corner forming unit is the same in height as the panels 6. It is of one piece character and consists of a pair of side flanges i 30. The latter are fiat and extend at right angles to one I another. The angle bar normally fits in the space between circular notches 17 in the side edges of the panels. As

' shown in the drawings the end edges of the reenforcing boards are disposed a small distance inwards of the side edges of the panels. Each of the reenforc'ing boards 19 "is provided on its outer surface with a horizontally exthe inner side edges of the panels 6 and is arranged so that its apex abuts against the inside inner corners of said panels and the outer surfaces of its side flanges 30 fit flatly against the inner side edges of the panels 6. As shown in the drawings, the side flanges 30 of the angle bar 7 are the same in width as the inner side edges of the panels 6. The angle bar 7 embodies adjacent to' the sockets 29 a horizontally disposed O-shaped metallic strap 31. The latter is disposed outwards of the free side edges of the side flanges 30 and consists of a straight intermediate part 32 and end parts 33. The end parts 33 are tending metallic strip 20. The strips 20are located mid-' way between the upper and lower edges of the reenforcing boards and are fixedly secured in place by way of screws 21. The ends of the strips 20 that are adjacent to the semi-circular notches 17 project beyond the adjacent end edges of the reenforcing panels andare bent 1nwards at substantially right angles so as to form ver- I of the end parts 33 of the O-shaped strap 31 are in cos ta "PM wa st tit t sex m #11816 and the free side edges of the side flanges by welds 36. The

mans

I parts 33 of the strap 31 together form "define vertically extending open ended sockets 37 in. juxtaposition or side by side relation with the sockets 29 that are formed by the inwardly bent inner ends of the metallic strips 20 that are associated with the panels 6.

The releasable devices 8 of the outside right angle corner forming unit are two in number. They are associated respectively with the panels 6 and are preferably the same in design and construction as the removable clamping devices for holding the panels of the complete form in edge to edge relation and also in fixed or rigid relation with the ends of the combined tie and spreader rods 14. Thereason for having the releasable devices 8 the same in construction as the removable clamping devices 15 is to standardize as much as possible the various parts or components of the form' as a whole. As shown in the drawings, the two releasable devices 8 embody cast metal brackets 38. The latter are horizo'ntally elongated, extend normally at rig ngles to th panels 6 and embody at the inner, ends thereof pairs of integral depending laterally spaced fingers 39. When the two releasable devices 8 are in their operativeposition as shown in Figures 1, 3 and 4, certain-fingers of the pairs extend downwards through the vertically extending open ended sockets 29 and the other depending fingers of the pairs extend downwards through the vertically extending open ended sockets 37 which, as previously pointed out, are formed by the inner and outer portions of the end parts 33 of the C-shaped strap 32. In connection with mounting of the releasable devices 8, the brackets 38 are positioned so that the pairs of spaced apart depending fingers 39 overlie the pairs of adjoining sockets 29 and 37. Thereafter, hammer blows are imparted to the inner ends of the brackets 38 so as to drive the brackets downwards and these cause the fingers to slide downwards into and through the aforementioned sockets. When the brackets are fully driven into place the pairs of depend ing fingers 39 serve to hold the angle bar 7 and the panels 6 in fixedly connected relation. The fingers 39 are preferably downwardly tapered in order that the inner side surfaces of each pair of depending fingers are downwardly divergent. As a result of this the fingers when driven downwards into and through the sockets 29 and 37 operate automatically to draw the panels 6 and the angle bar 7 towards one another into firmly clamped relation. When the devices 8 are in their operative position as shown in the drawings the pairs of depending fingers 39 are arranged in straddled relation with the outer portions 35 of the end parts 33 of the horizontally disposed strap 31.

The outside right angle corner forming unit is assembled by first placing the angle bar 7 in an upstanding or vertical position on a suitable foundation and then arranging the angle bar so that its apex extends in the proper direction. Thereafter, the panels 6 are arranged so that they extend vertically and are positioned at right angles to one another. After proper manipulation of the panels, the latter are slid in the direction of the angle bar 7 until their inner side edges are brought into abutting relation with the outer surfaces of the right angle side flanges of the angle bar. At the conclusion of the last mentioned operation, the two brackets 38 are positioned so that the pairs of depending fingers 39 overlie the sockets 29 and 37. After so positioning the brackets the latter are driven downwards so as to cause the fingers to fit within and extend through the aforementioned sockets. After the brackets are fully driven into place, the pairs of depending fingers 39 operate as heretofore pointed out to hold the angle bar 7 and the panel 6 in firmly clamped and connected relation. Upon assembly of the outside right angle corner forming unit the other parts of the form are manipulated into place as shown in Figure 4 and as heretofore described. When the form as a whole is complete, concrete in plastic or unset form is poured between the two series of edge to edge panels. After hardeningof the concrete theclainping devices '15 and the we releasable devices '8 are driven upwards so as to release the various panels including. the panels 6 of the outside right angle corner forming unit. After release of the panels the latter are removed and the projecting ends of the combined tie and spreader rods 14 are bent at right angles and then twisted so as to break the rods at the weakness points '24. As soon as the releasable devices 8 are removed the angle bar 7 is released so that it may be removed from the wall by shifting it laterally away from the wall.

The herein describedoutside right angle corner forming unit due to its particular design or construction effectively and efiiciently fulfills its intended purpose and is characterized-by thefactthat it may be installed and removed with facility and also produced or fabricated at a comparatively low cost.

Whereas the angle bar 7 of the unit has been described as having buta single horizontally disposed C-shaped strap 31, it is to be understood that it may have a vertical series of spaced apart straps depending upon its length. In' the event that the, angle bar 7 is provided with more than onestrap 31, each of the panels 6 isprovided with a corresponding number of reenforcing boards 19 and metallic strips 30. It is also to be understood that the invention is not to be restricted to the details set forth since they may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

1. As a new article of manufacture, an outside right angle corner forming unit adapted to form a part of a form for use in the formation of a concrete wall with a right angle bend therein, and comprising a pair of side by side upstanding rectangular panels positioned at right angles to one another and so that their inside inner corners are directly adjacent to one another, and embodying on their outer faces means forming a pair of oppositely disposed vertically extending sockets adjacent to the inner side edges of the panels, an upstanding angle bar of substantially the same height as the panels, consisting of right angle side flanges, positioned in the space between the inner side edges of the panels, arranged so that its apex abuts against said inside inner corners of the panels and the outer surfaces of its side flanges fit flatly against the inner side edges of the panels, and embodying adjacent to the socket-forming means a horizontally disposed C- shaped strap the end parts of which are connected to, and project outwards from, the adjacent portions of the free side edges of said side flanges and form vertically extending sockets in juxtaposition with the first mentioned sockets, and a pair of releasable brackets associated with, and disposed outwards of, the panels respectively, operative to hold the angle bar and the panels in fixedly connected relation, and each embodying a pair of depending laterally spaced downwardly tapered fingers one ot which extends slidably through one of the first mentioned sockets and the other of which extends slidably through the adjoining one of the second mentioned sockets, said fingers serving to draw said rectangular panels toward each other and consequently to draw said inner side edges of the panels against the side flanges of said upstanding angle bar.

2. As a new article of manufacture, an outside right angle corner forming unit adapted to form a part of a form for use in the formation of a concrete wall with a right angle bend therein, and comprising a pair of side by side upstanding rectangular panels positioned at right angles to one another and so that their inside inner corners are directly adjacent to one another, a pair of horizontally disposed reenforcing boards extending across, and secured to, the outer faces of the panels respectively and arranged so that they are in horizontal alignment and have the inner end edges thereof disposed a small end edges of the boards and bent inwards to form vertically extending sockets, an upstandingangle bar of substantially the same height as the panels, consisting of right angle side flanges, positioned in the space between the inner side edges of the panels, arranged so that its apex abuts against said inside inner corners of the panels and the'outer surfaces of its side flanges fit flatly against the inner side edges of the panels, and embodying adjacent to the inner ends of the metallic strips a horizontally disposed tc-shaped strap the end parts of which are connected to,

and project outwards from, the adjacent portions of the .free side edges of said side flanges and form vertically extending sockets in juxtaposition vwith the first mentioned sockets, and a pair of releasable brackets associated with, and disposed outwards of, the panels respectively, operative to hold the angle bar and the panels in fixedly connected relation, and each embodying a pair of depending laterally spaced fingers one of which extends downwards and slidably through one of the first mentioned sockets and the other of which extends downwards and slidably 8 through the adjoining one of the second mentioned sockets;

3; An outside right angle corner forming unit according'toclaim2 and in which-theangle bar and the strap 'are' formed of metal and the end parts of the strap are in the form of right angle bends and are welded to the adjacent portions of the free side edges of the side flanges of the angle bar.

4. An inside right angle corner forming unit according to claim 2 and wherein the pairs of depending laterally spaced fingers on the releasable brackets are downwardly tapered and so coact with the sockets that when slid downwards into place they draw the panels and angle bar together into firmly clamped relation.

References Cited in the file of this patent UNITED STATES PATENTS 1,032,419 Morrill July 16, 1912 20 1,599,035 Baumberger Sept. 7, 1926 1,621,563 Stevens Mar. 2.2, 1927 FOREIGN PATENTS 681,219 Great Britain 0ct.r22, 1952 

